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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Clarke, B. B.;
Majumdar, P.;
Thompson, D. |
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| Author Affiliation: | Department of Plant Pathology, Cook College, New Brunswick, NJ |
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| Title: | Efficacy of selected fungicides for the control of dollar spot in bentgrass, 1990 |
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| Source: | Fungicide and Nematicide Tests. Vol. 46, 1991, p. 294. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Fungicides; Research; Agrostis; Lanzia; Moellerodiscus; Cyproconazole; Dollar spot; Disease control; Foliar diseases; Diseases
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| Abstract/Contents: | "Several experimental and newly registered fungicides were examined at the Rutgers Turf Research Station in New Brunswick, N.J. for their ability to control dollar spot (Lanzia and Moellerodiscus spp.). Turf, consisting of 'Penncross' bentgrass, was established Sep 1985 on a Norton loam and maintained at 0.38 in cutting height throughout the 1990 growing season. Nitrogen was applied as urea on 20 Apr (1.2 lb actual N/1000 sp ft) and ammonium nitrate on 6 Jul (0.6 lb actual N/1000 sq ft). Turf was aerified with 0.25 in x 3 in hollow tines (2.0 in spacing) and then top dressed with a 0.124 in layer of Fertile Soil on 11 May. Soil pH averaged 6.5 throughout the test area. Weeds were controlled with 114 lb Betasan 7G/A on 27 Apr. Turf was irrigated as needed to avoid water stress. Plots were 3 ft x 9 ft and treatments were arranged in a randomized block design with four replications. Sprays were applied with a CO2 compressed air sprayer, T-jet nozzle 8003 E. adjusted to 30 psi, in a water equivalent of 1.9 gal/1000 sq ft. Fungicides were applied on 25 May (14 and 28 day treatments), 7 Jun (14 day treatment only), 21 Jun (14 and 28 day treatments), 5 Jul (14 day treatment only), and 19 Jul (14 and 28 day treatments). Plots were artificially inoculated on 15 Jun with a five isolate mixture of the pathogen (grown on autoclaved oats) to supplement natural infection. Treatments were visually evaluated for number of lesion centers per plot on the 5, 11, 18, and 25 of July, 9, 17, and 28 of Aug, and 17 Sep. Data was analyzed using ANOVA and a Duncan's multiple range test (DMRT). Dollar spot was first observed on 2 Jul and was uniformly distributed throughout the test area by 5 Jul. All treatments, except Fungo Flo 4.1F (2.0 fl oz; benzimidazole resistance confirmed) and EXP 10108A 15W (1.0 oz/28 day treatment schedule), provided good to excellent disease control for at least 21 days post-treatment (9 Aug). Residual activity was outstanding (57 days post-treatment) for EXP 10064B 1 7F (0.75, 1.5 and 3.0 fl oz), cyproconazole 40WG (0.167 and 0.25 oz), Rubigan 1AS (2.0 fl oz), RH 3866 2E ( 0.5 and 1.0 fl oz), Banner 1.1E (2.0 fl oz), Bayleton 25DF (1.0 oz), and Cleary 1-2-3 58W (3.0 oz; see table for application schedule). Daconil 2787 4F (6.0 fl oz), Rrubigan 1As (1.0 fl oz), Silbos 74DF (6.0 oz), EXP 10106A 2F (0.5 fl oz) + Chipco 26019 2F (2.0 fl oz), MON-18833 40W (0.63 oz), and R017530 5G (3 lb) also provided long lasting control (29-40 days). Although no phytotoxicity was observed, plots treated with cyproconazole 40WG (0.167 and 0.25 oz), EXP 10064B 1.7F (all rates) and R017530 5G (3 lb) were noticeable greener between 19 Jul and 14 Sept than untreated turf in the study." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only!
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Clarke, B. B., P. Majumdar, and D. Thompson. 1991. Efficacy of selected fungicides for the control of dollar spot in bentgrass, 1990. Fungicide Nematicide Tests. 46:p. 294. |
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